Define mass number. What is the mass number of an atom having 6 electrons and 7 neutrons?

Q. An atom having atomic mass number 13 has 7 neutrons. What is the atomic number of the atom?

Q. Number of electrons and neutrons in an atom are 6 and 8 respectively. What is the mass number of the atom?

Q. An uncharged atom has a mass number of 7 and contains 2 neutrons, find the number of electrons in it.

Q. An atom of an element contains $13$ electrons. Its nucleus has $14$ neutrons. Find out its atomic number and approximate atomic mass. An isotope has atomic mass $2$ units higher. What will be the number of protons, neutrons and electrons in the isotope?